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Common Logical Fallacies, Explained With Examples

Logical fallacies are flawed reasoning patterns that can make a weak argument sound persuasive. Here are the ones you will run into most often.

Straw man

Misrepresenting someone’s argument as a weaker, more extreme version of what they actually said, and then attacking that easier-to-knock-down version instead of their real position. Example: “You want better cycling infrastructure? So you think cars should be banned entirely?”

Ad hominem

Attacking the person making an argument, rather than the argument itself, as if a flaw in the speaker automatically disproves what they said. Example: “Why would we listen to her opinion on the budget? She has never even run a business.”

False dilemma (black-and-white thinking)

Presenting only two options as if they were the only possibilities, when more options actually exist. Example: “Either we cut the entire program, or the whole budget collapses” — ignoring any middle-ground option like a partial reduction.

Bandwagon (appeal to popularity)

Arguing that something must be true, good, or correct simply because a lot of people believe or do it, which does not actually establish whether it is true. Example: “Millions of people use this supplement, so it must work.”

Slippery slope

Claiming that one relatively small first step will inevitably lead to a chain of increasingly extreme consequences, without solid evidence that each step actually follows from the last. Example: “If we allow this one exception, eventually there will be no rules left at all.”

Appeal to authority

Treating a claim as true mainly because an authority figure said it, especially when that person is not actually an expert in the relevant field, or when even genuine experts disagree. Example: “A famous actor says this diet works, so it must be legitimate.”

Why fallacies work even on smart, careful people

Logical fallacies are persuasive precisely because they exploit normal mental shortcuts — trusting confident-sounding authority, disliking ambiguity, following social consensus — rather than requiring the listener to be careless or unintelligent. Recognizing a fallacy usually takes deliberately slowing down and asking whether the reasoning actually supports the conclusion, which most people do not do by default in a fast-paced conversation.

Spotting fallacies without becoming an insufferable debate pedant

Pointing out “that’s a straw man” in casual conversation can come across as dismissive rather than constructive. A more useful approach is often to restate the other person’s actual position back to them, or to name the specific missing option in a false dilemma, rather than simply labeling the fallacy and stopping there.

Frequently Asked Questions

If someone uses a logical fallacy, does that mean their conclusion is automatically wrong?

Not necessarily. A fallacy means the argument, as stated, does not actually prove its conclusion — but the conclusion itself could still happen to be true for other, better reasons. Fallacies are a flaw in the reasoning, not automatic proof that the underlying claim is false.

Can a valid argument also use a logical fallacy?

An argument that genuinely relies on a fallacy to reach its conclusion is not logically valid in the strict sense, even if the conclusion turns out to be true. It is worth separating whether a specific piece of reasoning holds up from whether the end conclusion happens to be correct — those are two different questions.